CVE-2026-43291: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net: nfc: nci: Fix parameter validation for packet data Since commit 9c328f54741b ("net: nfc: nci: Add parameter validation for packet data") communication with nci nfc chips is not working any more. The mentioned commit tries to fix access of uninitialized data, but failed to understand that in some cases the data packet is of variable length and can therefore not be compared to the maximum packet length given by the sizeof(struct).

Is your site exposed to CVE-2026-43291?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

8.3

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-908 CWE-908

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.15.195 — 5.15.202
linux	linux_kernel	6.1.156 — 6.1.165
linux	linux_kernel	6.6.112 — 6.6.128
linux	linux_kernel	6.12.53 — 6.12.75
linux	linux_kernel	6.17.3 — 6.18
linux	linux_kernel	6.18 — 6.18.16
linux	linux_kernel	6.19 — 6.19.6

References

Advisories & Patches

https://git.kernel.org/stable/c/3b91160e9a91b5a2662875417dc42dc5b0bf03ea https://git.kernel.org/stable/c/498fc5d0d650c77e87fcc73808d4f43240c21805 https://git.kernel.org/stable/c/571dcbeb8e635182bb825ae758399831805693c2 https://git.kernel.org/stable/c/a24a8a582da4426b2042e510a1080df84083b51d https://git.kernel.org/stable/c/ad058a4317db7fdb3f09caa6ed536d24a62ce6a0 https://git.kernel.org/stable/c/c692db813a7e3b7c3c17d6e9a3ad2a018bf1142b https://git.kernel.org/stable/c/f5218426f765eee22e178df9c126d974792fb6a5

Frequently Asked Questions

What is CVE-2026-43291? +

In the Linux kernel, the following vulnerability has been resolved: net: nfc: nci: Fix parameter validation for packet data Since commit 9c328f54741b ("net: nfc: nci: Add parameter validation for packet data") communication with nci nfc chips is not working any more. The mentioned commit tries to fix access of uninitialized data, but failed to understand that in some cases the data packet is of variable length and can therefore not be compared to the maximum packet length given by the sizeof(struct). It has a CVSS v3.1 base score of 8.3 (HIGH).

How severe is CVE-2026-43291? +

CVE-2026-43291 has a CVSS v3.1 score of 8.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43291? +

CVE-2026-43291 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43291? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-2329

In high traffic environments, a Silicon Labs OpenThread RCP (see impacted versions) fails to clear the SPI transmit buffer and …

CVE-2025-48513

Use of uninitialized resource within the AMD Platform Management Framework (PMF) could allow an attacker to read a uninitialized kernel …

CVE-2026-49425

The compat32 kevent() handler translates a 64-bit kevent struct into a stack- declared 32-bit struct. It did not first zero …

CVE-2026-49424

The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t. It did not first zero the …

CVE-2026-58084

To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For …

CVE-2026-49423

When building the iovec array for a received TLS 1.2 CBC record, ktls_ocf_tls_cbc_decrypt() incremented the iovec index for every mbuf …

CVE-2026-43291